Fix everything.

system/programs/default.nix

@@ -0,0 +1,9 @@
+{ ... }:
+{
+  imports = [
+    ./doas
+    ./git
+    ./home-manager
+    ./shells
+  ];
+}

system/programs/doas/default.nix

@@ -0,0 +1,18 @@
+{ ... }:
+{
+  security = {
+    sudo.enable = false;
+    doas = {
+      enable = true;
+      extraRules = [
+        { # Give wheel root access
+          groups = [ "wheel" ];
+          keepEnv = true;
+          persist = true;
+        }
+      ];
+    };
+  };
+
+  environment.systemPackages = with pkgs; [ doas-sudo-shim ];
+}

system/programs/git/default.nix

@@ -0,0 +1,7 @@
+{ ... }:
+{
+  programs.git = {
+    enable = true;
+    lfs.enable = true;
+  };
+}

system/programs/home-manager/default.nix

@@ -0,0 +1,12 @@
+{ unstable, ... }:
+{
+  home-manager = {
+    useUserPackages = true;
+    backupFileExtension = "bak";
+    extraSpecialArgs = {
+      inherit
+        unstable
+        ;
+    };
+  };
+}

system/programs/shells/default.nix

@@ -0,0 +1,7 @@
+{ pkgs, ... }:
+{
+  programs.fish.enable = true;
+  users.defaultUserShell = pkgs.fish;
+
+  programs.zsh.enable = true;
+}